Los músculos intercostales externos forman parte de la pared torácica. Son los más superficiales de los músculos intercostales. Sus fibras están orientadas en dirección inferior y anterior. Inserciones: se originan en el borde inferior de cada costilla y se insertan en el borde superior de la costilla inferior. Acciones: elevan las costillas y aumentan el volumen torácico durante la inspiración. Inervación: nervios intercostales (T1-T11). Irrigación sanguínea: arterias intercostales anteriores y posteriores. By TeachMeSeries Ltd (2026) Fig. 1: los músculos intercostales externos e internos de la pared torácica. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Pro Feature - Dissection Atlas Prosection of the muscles of the thoracic wall. Prosection of the muscles of the thoracic wall. You've Discovered a Pro Feature Access our Dissection Image Library Enhance your understanding with high-resolution dissection images showcasing real-life anatomy. Learn More Frequent questions What are the intercostales externos muscles? The intercostales externos muscles are the most superficial muscles of the thoracic wall. They play a crucial role in respiratory mechanics by facilitating rib elevation during inhalation. What is the function of the intercostales externos? The primary function of the intercostales externos is to elevate the ribs, which increases the thoracic volume during inspiration. This action is essential for effective breathing. Where do the intercostales externos muscles attach? These muscles originate from the inferior border of each rib and insert into the superior border of the rib below. This arrangement allows them to effectively elevate the ribs. How are the intercostales externos innervated? The intercostales externos are innervated by the intercostal nerves, specifically from T1 to T11. This nerve supply is vital for their contraction and function during breathing. What is the blood supply to the intercostales externos? The intercostales externos receive blood from both the anterior and posterior intercostal arteries. This vascular supply is important for their metabolic needs and overall function. Rate This Article